<template>
  <view>
    <my-search @click='toSearch'></my-search>
    <view class="scroll-view-container">
      <!-- 左侧的滚动视图区域 -->
      <scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}">
        <block v-for="(item,i) in cateList" :key="i">
          <view :class="['left-scroll-view-item',i==active? 'active':'']" @click="changeActive(i)">{{item.cat_name}}
          </view>
        </block>
      </scroll-view>
      <!-- 右侧的滚动视图区域 -->
      <scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scollTop">
        <view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
          <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
          <view class="cate-lv3-list">
            <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" @click="ToGoodsList(item3)" :key="i3">
              <image :src="item3.cat_icon"> </image>
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>

  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  export default {
    data() {
      return {
        wh: 0,
        cateList: [],
        active: 0,
        cateLevel2: [],
        scollTop:0
      };
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      this.wh = sysInfo.windowHeight -50
      this.getCateList()
    },
     mixins: [badgeMix],
    methods: {
      // 获得一级列表数据
      async getCateList() {
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/categories')
        if (res.meta.status !== 200) return uni.$showMsg()
        this.cateList = res.message
        this.cateLevel2 = res.message[0].children
      },
      // 处理active
      changeActive(i) {
        this.active = i
        this.cateLevel2 = this.cateList[i].children
        this.scollTop=this.scollTop? 0 :1
      },
      // 跳转到商品列表
      ToGoodsList(item3){
        uni.navigateTo({
          url:'../../subpkg/goods_list/goods_list?cid='+item3.cat_id
        })
      },
      // 去搜索
      toSearch(){
        uni.navigateTo({
          url:'../../subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex;

    .left-scroll-view {
      width: 120px;

      .left-scroll-view-item {
        line-height: 60px;
        text-align: center;
        background-color: #f7f7f7;
        font-size: 12px;

        &.active {
          background-color: #ffffff;
          position: relative;

          &::before {
            content: '';
            display: block;
            width: 3px;
            height: 30px;
            background-color: #C00000;
            position: absolute;
            top: 25%;
            left: 0;
          }
        }
      }
    }

    .right-scroll-view {
      background-color: #ffffff;
    }

    .cate-lv2-title {
      font-size: 12px;
      font-weight: bold;
      text-align: center;
      padding: 15px 0;

    }

    .cate-lv3-list {
      display: flex;
      flex-wrap: wrap;

      .cate-lv3-item {
        width: 33.33%;
        display: flex;
        margin-bottom: 10px;
        flex-direction: column;
        align-items: center;

        image {
          width: 120rpx;
          height: 120rpx;
        }

        text {
          font-size: 12px;
        }
      }
    }
  }
</style>
